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Lights out: There were two power outages at Candlestick Park during Monday’s game.

Seeking to avoid another embarrassing power failure at Candlestick Park during any upcoming 49ers playoff games, Mayor Ed Lee on Thursday ordered written assurance from PG&E and The City saying it won’t occur again. The two entities appear to have taken joint responsibility for the nationally televised debacle.

The lights went dim twice during the much-anticipated “Monday Night Football” matchup with the Pittsburgh Steelers.

The mayor said PG&E CEO Anthony Earley should tell the team it doesn’t have to worry about future problems at the aging stadium, which The City owns and leases to the 49ers.

“I want something in writing from Mr. Earley or PG&E folks that they’ve not only repaired the line, but that they’ve inspected it to the point that they can assure us it won’t happen again,” Lee said.

On Thursday evening, the utility complied, sending a letter informing the team that it is conducting a “failure analysis” of a broken power line. The first outage followed a spectacular breakage in one of PG&E’s 12,000-volt overhead lines, which provided a big flash outside the stadium parking lot and knocked out power, delaying kickoff.

The reason for the second failure was a faulty city-owned auxiliary power switch inside the stadium, according to a letter sent to the team by Lee on Thursday evening.

“We are replacing that switch starting tomorrow with an estimated completion date of next Wednesday,” the mayor wrote.

Depending on the outcome of the final two weeks of the regular season, the Niners could be playing at Candlestick as soon as Jan. 7.

Katie Romans, a spokeswoman for PG&E, said Thursday the utility is planning to send the team a written summary of fixes done in the Candlestick area, including repairs to seven line “splices” — at least one of which split Monday night to cause the flash before the first outage.

Steve Weakland, a spokesman for the 49ers, said the team is pleased with PG&E and The City pro-actively seeking to fix the problem.dschreiber@sfexaminer.com